1 /* $NetBSD: rpcb_clnt.c,v 1.29 2013/03/11 20:19:29 tron Exp $ */ 2 3 /* 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 /* 34 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 35 */ 36 37 /* #ident "@(#)rpcb_clnt.c 1.27 94/04/24 SMI" */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro"; 43 #else 44 __RCSID("$NetBSD: rpcb_clnt.c,v 1.29 2013/03/11 20:19:29 tron Exp $"); 45 #endif 46 #endif 47 48 /* 49 * rpcb_clnt.c 50 * interface to rpcbind rpc service. 51 * 52 * Copyright (C) 1988, Sun Microsystems, Inc. 53 */ 54 55 #include "namespace.h" 56 #include "reentrant.h" 57 #include <sys/types.h> 58 #include <sys/socket.h> 59 #include <sys/un.h> 60 #include <sys/utsname.h> 61 #include <rpc/rpc.h> 62 #include <rpc/rpcb_prot.h> 63 #include <rpc/nettype.h> 64 #include <netconfig.h> 65 #ifdef PORTMAP 66 #include <netinet/in.h> /* FOR IPPROTO_TCP/UDP definitions */ 67 #include <rpc/pmap_prot.h> 68 #endif 69 #include <assert.h> 70 #include <errno.h> 71 #include <netdb.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <syslog.h> 76 #include <unistd.h> 77 78 #include "svc_fdset.h" 79 #include "rpc_internal.h" 80 81 #ifdef __weak_alias 82 __weak_alias(rpcb_set,_rpcb_set) 83 __weak_alias(rpcb_unset,_rpcb_unset) 84 __weak_alias(rpcb_getmaps,_rpcb_getmaps) 85 __weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 86 __weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 87 #endif 88 89 static struct timeval tottimeout = { 60, 0 }; 90 static const struct timeval rmttimeout = { 3, 0 }; 91 92 static const char nullstring[] = "\000"; 93 94 #define CACHESIZE 6 95 96 struct address_cache { 97 char *ac_host; 98 char *ac_netid; 99 char *ac_uaddr; 100 struct netbuf *ac_taddr; 101 struct address_cache *ac_next; 102 }; 103 104 static struct address_cache *front; 105 static int cachesize; 106 107 #define CLCR_GET_RPCB_TIMEOUT 1 108 #define CLCR_SET_RPCB_TIMEOUT 2 109 110 111 extern int __rpc_lowvers; 112 113 static struct address_cache *check_cache(const char *, const char *); 114 static void delete_cache(struct netbuf *); 115 static void add_cache(const char *, const char *, struct netbuf *, char *); 116 static CLIENT *getclnthandle(const char *, const struct netconfig *, char **); 117 static CLIENT *local_rpcb(void); 118 static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *); 119 120 /* 121 * This routine adjusts the timeout used for calls to the remote rpcbind. 122 * Also, this routine can be used to set the use of portmapper version 2 123 * only when doing rpc_broadcasts 124 * These are private routines that may not be provided in future releases. 125 */ 126 bool_t 127 __rpc_control(int request, void *info) 128 { 129 130 _DIAGASSERT(info != NULL); 131 132 switch (request) { 133 case CLCR_GET_RPCB_TIMEOUT: 134 *(struct timeval *)info = tottimeout; 135 break; 136 case CLCR_SET_RPCB_TIMEOUT: 137 tottimeout = *(struct timeval *)info; 138 break; 139 case CLCR_SET_LOWVERS: 140 __rpc_lowvers = *(int *)info; 141 break; 142 case CLCR_GET_LOWVERS: 143 *(int *)info = __rpc_lowvers; 144 break; 145 default: 146 return (FALSE); 147 } 148 return (TRUE); 149 } 150 151 /* 152 * It might seem that a reader/writer lock would be more reasonable here. 153 * However because getclnthandle(), the only user of the cache functions, 154 * may do a delete_cache() operation if a check_cache() fails to return an 155 * address useful to clnt_tli_create(), we may as well use a mutex. 156 */ 157 /* 158 * As it turns out, if the cache lock is *not* a reader/writer lock, we will 159 * block all clnt_create's if we are trying to connect to a host that's down, 160 * since the lock will be held all during that time. 161 */ 162 #ifdef _REENTRANT 163 extern rwlock_t rpcbaddr_cache_lock; 164 #endif 165 166 /* 167 * The routines check_cache(), add_cache(), delete_cache() manage the 168 * cache of rpcbind addresses for (host, netid). 169 */ 170 171 static struct address_cache * 172 check_cache(const char *host, const char *netid) 173 { 174 struct address_cache *cptr; 175 176 _DIAGASSERT(host != NULL); 177 _DIAGASSERT(netid != NULL); 178 179 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 180 181 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 182 if (!strcmp(cptr->ac_host, host) && 183 !strcmp(cptr->ac_netid, netid)) { 184 #ifdef ND_DEBUG 185 fprintf(stderr, "Found cache entry for %s: %s\n", 186 host, netid); 187 #endif 188 return (cptr); 189 } 190 } 191 return NULL; 192 } 193 194 static void 195 delete_cache(struct netbuf *addr) 196 { 197 struct address_cache *cptr, *prevptr = NULL; 198 199 _DIAGASSERT(addr != NULL); 200 201 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 202 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 203 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { 204 free(cptr->ac_host); 205 free(cptr->ac_netid); 206 free(cptr->ac_taddr->buf); 207 free(cptr->ac_taddr); 208 if (cptr->ac_uaddr) 209 free(cptr->ac_uaddr); 210 if (prevptr) 211 prevptr->ac_next = cptr->ac_next; 212 else 213 front = cptr->ac_next; 214 free(cptr); 215 cachesize--; 216 break; 217 } 218 prevptr = cptr; 219 } 220 } 221 222 static void 223 add_cache(const char *host, const char *netid, struct netbuf *taddr, 224 char *uaddr) 225 { 226 struct address_cache *ad_cache, *cptr, *prevptr; 227 228 _DIAGASSERT(host != NULL); 229 _DIAGASSERT(netid != NULL); 230 /* uaddr may be NULL */ 231 /* taddr may be NULL ??? */ 232 233 ad_cache = malloc(sizeof(*ad_cache)); 234 if (!ad_cache) { 235 return; 236 } 237 ad_cache->ac_host = strdup(host); 238 ad_cache->ac_netid = strdup(netid); 239 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; 240 ad_cache->ac_taddr = malloc(sizeof(*ad_cache->ac_taddr)); 241 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 242 (uaddr && !ad_cache->ac_uaddr)) { 243 goto out; 244 } 245 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 246 ad_cache->ac_taddr->buf = malloc(taddr->len); 247 if (ad_cache->ac_taddr->buf == NULL) { 248 out: 249 if (ad_cache->ac_host) 250 free(ad_cache->ac_host); 251 if (ad_cache->ac_netid) 252 free(ad_cache->ac_netid); 253 if (ad_cache->ac_uaddr) 254 free(ad_cache->ac_uaddr); 255 if (ad_cache->ac_taddr) 256 free(ad_cache->ac_taddr); 257 free(ad_cache); 258 return; 259 } 260 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 261 #ifdef ND_DEBUG 262 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 263 #endif 264 265 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 266 267 rwlock_wrlock(&rpcbaddr_cache_lock); 268 if (cachesize < CACHESIZE) { 269 ad_cache->ac_next = front; 270 front = ad_cache; 271 cachesize++; 272 } else { 273 /* Free the last entry */ 274 cptr = front; 275 prevptr = NULL; 276 while (cptr->ac_next) { 277 prevptr = cptr; 278 cptr = cptr->ac_next; 279 } 280 281 #ifdef ND_DEBUG 282 fprintf(stderr, "Deleted from cache: %s : %s\n", 283 cptr->ac_host, cptr->ac_netid); 284 #endif 285 free(cptr->ac_host); 286 free(cptr->ac_netid); 287 free(cptr->ac_taddr->buf); 288 free(cptr->ac_taddr); 289 if (cptr->ac_uaddr) 290 free(cptr->ac_uaddr); 291 292 if (prevptr) { 293 prevptr->ac_next = NULL; 294 ad_cache->ac_next = front; 295 front = ad_cache; 296 } else { 297 front = ad_cache; 298 ad_cache->ac_next = NULL; 299 } 300 free(cptr); 301 } 302 rwlock_unlock(&rpcbaddr_cache_lock); 303 } 304 305 /* 306 * This routine will return a client handle that is connected to the 307 * rpcbind. Returns NULL on error and free's everything. 308 */ 309 static CLIENT * 310 getclnthandle(const char *host, const struct netconfig *nconf, char **targaddr) 311 { 312 CLIENT *client; 313 struct netbuf *addr, taddr; 314 struct netbuf addr_to_delete; 315 struct __rpc_sockinfo si; 316 struct addrinfo hints, *res, *tres; 317 struct address_cache *ad_cache; 318 char *tmpaddr; 319 320 _DIAGASSERT(host != NULL); 321 _DIAGASSERT(nconf != NULL); 322 /* targaddr may be NULL */ 323 324 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 325 326 /* Get the address of the rpcbind. Check cache first */ 327 client = NULL; 328 addr_to_delete.len = 0; 329 addr_to_delete.buf = NULL; 330 rwlock_rdlock(&rpcbaddr_cache_lock); 331 ad_cache = check_cache(host, nconf->nc_netid); 332 if (ad_cache != NULL) { 333 addr = ad_cache->ac_taddr; 334 client = clnt_tli_create(RPC_ANYFD, nconf, addr, 335 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 336 if (client != NULL) { 337 if (targaddr) 338 *targaddr = ad_cache->ac_uaddr; 339 rwlock_unlock(&rpcbaddr_cache_lock); 340 return (client); 341 } 342 addr_to_delete.len = addr->len; 343 addr_to_delete.buf = malloc(addr->len); 344 if (addr_to_delete.buf == NULL) { 345 addr_to_delete.len = 0; 346 } else { 347 memcpy(addr_to_delete.buf, addr->buf, addr->len); 348 } 349 } 350 rwlock_unlock(&rpcbaddr_cache_lock); 351 if (addr_to_delete.len != 0) { 352 /* 353 * Assume this may be due to cache data being 354 * outdated 355 */ 356 rwlock_wrlock(&rpcbaddr_cache_lock); 357 delete_cache(&addr_to_delete); 358 rwlock_unlock(&rpcbaddr_cache_lock); 359 free(addr_to_delete.buf); 360 } 361 if (!__rpc_nconf2sockinfo(nconf, &si)) { 362 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 363 return NULL; 364 } 365 366 memset(&hints, 0, sizeof hints); 367 hints.ai_family = si.si_af; 368 hints.ai_socktype = si.si_socktype; 369 hints.ai_protocol = si.si_proto; 370 371 #ifdef CLNT_DEBUG 372 printf("trying netid %s family %d proto %d socktype %d\n", 373 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 374 #endif 375 376 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 377 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 378 return NULL; 379 } 380 381 for (tres = res; tres != NULL; tres = tres->ai_next) { 382 taddr.buf = tres->ai_addr; 383 taddr.len = taddr.maxlen = tres->ai_addrlen; 384 385 #ifdef ND_DEBUG 386 { 387 char *ua; 388 389 ua = taddr2uaddr(nconf, &taddr); 390 fprintf(stderr, "Got it [%s]\n", ua); 391 free(ua); 392 } 393 #endif 394 395 #ifdef ND_DEBUG 396 { 397 int i; 398 399 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 400 taddr.len, taddr.maxlen); 401 fprintf(stderr, "\tAddress is "); 402 for (i = 0; i < taddr.len; i++) 403 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 404 fprintf(stderr, "\n"); 405 } 406 #endif 407 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 408 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 409 #ifdef ND_DEBUG 410 if (! client) { 411 clnt_pcreateerror("rpcbind clnt interface"); 412 } 413 #endif 414 415 if (client) { 416 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 417 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 418 if (targaddr) 419 *targaddr = tmpaddr; 420 break; 421 } 422 } 423 freeaddrinfo(res); 424 return (client); 425 } 426 427 /* XXX */ 428 #define IN4_LOCALHOST_STRING "127.0.0.1" 429 #define IN6_LOCALHOST_STRING "::1" 430 431 /* 432 * This routine will return a client handle that is connected to the local 433 * rpcbind. Returns NULL on error and free's everything. 434 */ 435 static CLIENT * 436 local_rpcb(void) 437 { 438 CLIENT *client; 439 static struct netconfig *loopnconf; 440 static const char *hostname; 441 #ifdef _REENTRANT 442 extern mutex_t loopnconf_lock; 443 #endif 444 int sock; 445 size_t tsize; 446 struct netbuf nbuf; 447 struct sockaddr_un sun; 448 449 /* 450 * Try connecting to the local rpcbind through a local socket 451 * first. If this doesn't work, try all transports defined in 452 * the netconfig file. 453 */ 454 memset(&sun, 0, sizeof sun); 455 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 456 if (sock < 0) 457 goto try_nconf; 458 sun.sun_family = AF_LOCAL; 459 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 460 tsize = SUN_LEN(&sun); 461 _DIAGASSERT(__type_fit(uint8_t, tsize)); 462 nbuf.len = sun.sun_len = (uint8_t)tsize; 463 nbuf.maxlen = sizeof (struct sockaddr_un); 464 nbuf.buf = &sun; 465 466 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 467 _DIAGASSERT(__type_fit(u_int, tsize)); 468 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 469 (rpcvers_t)RPCBVERS, (u_int)tsize, (u_int)tsize); 470 471 if (client != NULL) { 472 /* XXX - mark the socket to be closed in destructor */ 473 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); 474 return client; 475 } 476 477 /* XXX - nobody needs this socket anymore, free the descriptor */ 478 close(sock); 479 480 try_nconf: 481 482 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 483 mutex_lock(&loopnconf_lock); 484 if (loopnconf == NULL) { 485 struct netconfig *nconf, *tmpnconf = NULL; 486 void *nc_handle; 487 int fd; 488 489 nc_handle = setnetconfig(); 490 if (nc_handle == NULL) { 491 /* fails to open netconfig file */ 492 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 493 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 494 mutex_unlock(&loopnconf_lock); 495 return (NULL); 496 } 497 while ((nconf = getnetconfig(nc_handle)) != NULL) { 498 #ifdef INET6 499 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 500 #else 501 if (( 502 #endif 503 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 504 (nconf->nc_semantics == NC_TPI_COTS || 505 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 506 fd = __rpc_nconf2fd(nconf); 507 /* 508 * Can't create a socket, assume that 509 * this family isn't configured in the kernel. 510 */ 511 if (fd < 0) 512 continue; 513 close(fd); 514 tmpnconf = nconf; 515 if (!strcmp(nconf->nc_protofmly, NC_INET)) 516 hostname = IN4_LOCALHOST_STRING; 517 else 518 hostname = IN6_LOCALHOST_STRING; 519 } 520 } 521 if (tmpnconf == NULL) { 522 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 523 mutex_unlock(&loopnconf_lock); 524 return (NULL); 525 } 526 loopnconf = getnetconfigent(tmpnconf->nc_netid); 527 /* loopnconf is never freed */ 528 endnetconfig(nc_handle); 529 } 530 mutex_unlock(&loopnconf_lock); 531 client = getclnthandle(hostname, loopnconf, NULL); 532 return (client); 533 } 534 535 /* 536 * Set a mapping between program, version and address. 537 * Calls the rpcbind service to do the mapping. 538 */ 539 bool_t 540 rpcb_set(rpcprog_t program, rpcvers_t version, 541 const struct netconfig *nconf, /* Network structure of transport */ 542 const struct netbuf *address) /* Services netconfig address */ 543 { 544 CLIENT *client; 545 bool_t rslt = FALSE; 546 RPCB parms; 547 char uidbuf[32]; 548 549 /* parameter checking */ 550 if (nconf == NULL) { 551 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 552 return (FALSE); 553 } 554 if (address == NULL) { 555 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 556 return (FALSE); 557 } 558 client = local_rpcb(); 559 if (! client) { 560 return (FALSE); 561 } 562 563 /* convert to universal */ 564 parms.r_addr = taddr2uaddr(__UNCONST(nconf), __UNCONST(address)); 565 if (!parms.r_addr) { 566 CLNT_DESTROY(client); 567 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 568 return (FALSE); /* no universal address */ 569 } 570 parms.r_prog = program; 571 parms.r_vers = version; 572 parms.r_netid = nconf->nc_netid; 573 /* 574 * Though uid is not being used directly, we still send it for 575 * completeness. For non-unix platforms, perhaps some other 576 * string or an empty string can be sent. 577 */ 578 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 579 parms.r_owner = uidbuf; 580 581 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 582 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 583 (char *)(void *)&rslt, tottimeout); 584 585 CLNT_DESTROY(client); 586 free(parms.r_addr); 587 return (rslt); 588 } 589 590 /* 591 * Remove the mapping between program, version and netbuf address. 592 * Calls the rpcbind service to do the un-mapping. 593 * If netbuf is NULL, unset for all the transports, otherwise unset 594 * only for the given transport. 595 */ 596 bool_t 597 rpcb_unset(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf) 598 { 599 CLIENT *client; 600 bool_t rslt = FALSE; 601 RPCB parms; 602 char uidbuf[32]; 603 604 client = local_rpcb(); 605 if (! client) { 606 return (FALSE); 607 } 608 609 parms.r_prog = program; 610 parms.r_vers = version; 611 if (nconf) 612 parms.r_netid = nconf->nc_netid; 613 else { 614 parms.r_netid = __UNCONST(&nullstring[0]); /* unsets all */ 615 } 616 parms.r_addr = __UNCONST(&nullstring[0]); 617 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 618 parms.r_owner = uidbuf; 619 620 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 621 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 622 (char *)(void *)&rslt, tottimeout); 623 624 CLNT_DESTROY(client); 625 return (rslt); 626 } 627 628 /* 629 * From the merged list, find the appropriate entry 630 */ 631 static struct netbuf * 632 got_entry(rpcb_entry_list_ptr relp, const struct netconfig *nconf) 633 { 634 struct netbuf *na = NULL; 635 rpcb_entry_list_ptr sp; 636 rpcb_entry *rmap; 637 638 _DIAGASSERT(nconf != NULL); 639 640 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 641 rmap = &sp->rpcb_entry_map; 642 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 643 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 644 (nconf->nc_semantics == rmap->r_nc_semantics) && 645 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) { 646 na = uaddr2taddr(nconf, rmap->r_maddr); 647 #ifdef ND_DEBUG 648 fprintf(stderr, "\tRemote address is [%s].\n", 649 rmap->r_maddr); 650 if (!na) 651 fprintf(stderr, 652 "\tCouldn't resolve remote address!\n"); 653 #endif 654 break; 655 } 656 } 657 return (na); 658 } 659 660 /* 661 * An internal function which optimizes rpcb_getaddr function. It also 662 * returns the client handle that it uses to contact the remote rpcbind. 663 * 664 * The algorithm used: If the transports is TCP or UDP, it first tries 665 * version 2 (portmap), 4 and then 3 (svr4). This order should be 666 * changed in the next OS release to 4, 2 and 3. We are assuming that by 667 * that time, version 4 would be available on many machines on the network. 668 * With this algorithm, we get performance as well as a plan for 669 * obsoleting version 2. 670 * 671 * For all other transports, the algorithm remains as 4 and then 3. 672 * 673 * XXX: Due to some problems with t_connect(), we do not reuse the same client 674 * handle for COTS cases and hence in these cases we do not return the 675 * client handle. This code will change if t_connect() ever 676 * starts working properly. Also look under clnt_vc.c. 677 */ 678 struct netbuf * 679 __rpcb_findaddr(rpcprog_t program, rpcvers_t version, 680 const struct netconfig *nconf, const char *host, CLIENT **clpp) 681 { 682 CLIENT *client = NULL; 683 RPCB parms; 684 enum clnt_stat clnt_st; 685 char *ua = NULL; 686 rpcvers_t vers; 687 struct netbuf *address = NULL; 688 rpcvers_t start_vers = RPCBVERS4; 689 struct netbuf servaddr; 690 691 /* nconf is handled below */ 692 _DIAGASSERT(host != NULL); 693 /* clpp may be NULL */ 694 695 /* parameter checking */ 696 if (nconf == NULL) { 697 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 698 return (NULL); 699 } 700 701 parms.r_addr = NULL; 702 703 #ifdef PORTMAP 704 /* Try version 2 for TCP or UDP */ 705 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 706 u_short port = 0; 707 struct netbuf remote; 708 rpcvers_t pmapvers = 2; 709 struct pmap pmapparms; 710 711 /* 712 * Try UDP only - there are some portmappers out 713 * there that use UDP only. 714 */ 715 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 716 struct netconfig *newnconf; 717 718 if ((newnconf = getnetconfigent("udp")) == NULL) { 719 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 720 return (NULL); 721 } 722 client = getclnthandle(host, newnconf, &parms.r_addr); 723 freenetconfigent(newnconf); 724 } else { 725 client = getclnthandle(host, nconf, &parms.r_addr); 726 } 727 if (client == NULL) { 728 return (NULL); 729 } 730 731 /* Set the version */ 732 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 733 pmapparms.pm_prog = program; 734 pmapparms.pm_vers = version; 735 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 736 IPPROTO_UDP : IPPROTO_TCP; 737 pmapparms.pm_port = 0; /* not needed */ 738 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 739 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 740 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 741 tottimeout); 742 if (clnt_st != RPC_SUCCESS) { 743 if ((clnt_st == RPC_PROGVERSMISMATCH) || 744 (clnt_st == RPC_PROGUNAVAIL)) 745 goto try_rpcbind; /* Try different versions */ 746 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 747 clnt_geterr(client, &rpc_createerr.cf_error); 748 goto error; 749 } else if (port == 0) { 750 address = NULL; 751 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 752 goto error; 753 } 754 port = htons(port); 755 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 756 if (((address = malloc(sizeof(struct netbuf))) == NULL) || 757 ((address->buf = malloc(remote.len)) == NULL)) { 758 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 759 clnt_geterr(client, &rpc_createerr.cf_error); 760 if (address) { 761 free(address); 762 address = NULL; 763 } 764 goto error; 765 } 766 memcpy(address->buf, remote.buf, remote.len); 767 memcpy(&((char *)address->buf)[sizeof (short)], 768 (char *)(void *)&port, sizeof (short)); 769 address->len = address->maxlen = remote.len; 770 goto done; 771 } 772 #endif 773 774 try_rpcbind: 775 /* 776 * Now we try version 4 and then 3. 777 * We also send the remote system the address we used to 778 * contact it in case it can help to connect back with us 779 */ 780 parms.r_prog = program; 781 parms.r_vers = version; 782 parms.r_owner = __UNCONST(&nullstring[0]); /* not needed; */ 783 /* just for xdring */ 784 parms.r_netid = nconf->nc_netid; /* not really needed */ 785 786 /* 787 * If a COTS transport is being used, try getting address via CLTS 788 * transport. This works only with version 4. 789 * NOTE: This is being done for all transports EXCEPT LOOPBACK 790 * because with loopback the cost to go to a COTS is same as 791 * the cost to go through CLTS, plus you get the advantage of 792 * finding out immediately if the local rpcbind process is dead. 793 */ 794 #if 1 795 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 796 nconf->nc_semantics == NC_TPI_COTS) && 797 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 798 #else 799 if (client != NULL) { 800 CLNT_DESTROY(client); 801 client = NULL; 802 } 803 if (nconf->nc_semantics == NC_TPI_CLTS) 804 #endif 805 { 806 void *handle; 807 struct netconfig *nconf_clts; 808 rpcb_entry_list_ptr relp = NULL; 809 810 if (client == NULL) { 811 /* This did not go through the above PORTMAP/TCP code */ 812 #if 1 813 if ((handle = __rpc_setconf("datagram_v")) != NULL) 814 #else 815 if ((handle = __rpc_setconf("circuit_v")) != NULL) 816 #endif 817 { 818 while ((nconf_clts = __rpc_getconf(handle)) 819 != NULL) { 820 if (strcmp(nconf_clts->nc_protofmly, 821 nconf->nc_protofmly) != 0) { 822 continue; 823 } 824 client = getclnthandle(host, nconf_clts, 825 &parms.r_addr); 826 break; 827 } 828 __rpc_endconf(handle); 829 } 830 if (client == NULL) 831 goto regular_rpcbind; /* Go the regular way */ 832 } else { 833 /* This is a UDP PORTMAP handle. Change to version 4 */ 834 vers = RPCBVERS4; 835 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 836 } 837 /* 838 * We also send the remote system the address we used to 839 * contact it in case it can help it connect back with us 840 */ 841 if (parms.r_addr == NULL) { 842 /* for XDRing */ 843 parms.r_addr = __UNCONST(&nullstring[0]); 844 } 845 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 846 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 847 (xdrproc_t) xdr_rpcb_entry_list_ptr, 848 (char *)(void *)&relp, tottimeout); 849 if (clnt_st == RPC_SUCCESS) { 850 if ((address = got_entry(relp, nconf)) != NULL) { 851 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 852 (char *)(void *)&relp); 853 CLNT_CONTROL(client, CLGET_SVC_ADDR, 854 (char *)(void *)&servaddr); 855 __rpc_fixup_addr(address, &servaddr); 856 goto done; 857 } 858 /* Entry not found for this transport */ 859 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 860 (char *)(void *)&relp); 861 /* 862 * XXX: should have perhaps returned with error but 863 * since the remote machine might not always be able 864 * to send the address on all transports, we try the 865 * regular way with regular_rpcbind 866 */ 867 goto regular_rpcbind; 868 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 869 (clnt_st == RPC_PROGUNAVAIL)) { 870 start_vers = RPCBVERS; /* Try version 3 now */ 871 goto regular_rpcbind; /* Try different versions */ 872 } else { 873 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 874 clnt_geterr(client, &rpc_createerr.cf_error); 875 goto error; 876 } 877 } 878 879 regular_rpcbind: 880 881 /* Now the same transport is to be used to get the address */ 882 #if 1 883 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 884 (nconf->nc_semantics == NC_TPI_COTS))) 885 #else 886 if (client && nconf->nc_semantics == NC_TPI_CLTS) 887 #endif 888 { 889 /* A CLTS type of client - destroy it */ 890 CLNT_DESTROY(client); 891 client = NULL; 892 } 893 894 if (client == NULL) { 895 client = getclnthandle(host, nconf, &parms.r_addr); 896 if (client == NULL) { 897 goto error; 898 } 899 } 900 if (parms.r_addr == NULL) 901 parms.r_addr = __UNCONST(&nullstring[0]); 902 903 /* First try from start_vers and then version 3 (RPCBVERS) */ 904 for (vers = start_vers; vers >= RPCBVERS; vers--) { 905 /* Set the version */ 906 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 907 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 908 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 909 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 910 tottimeout); 911 if (clnt_st == RPC_SUCCESS) { 912 if ((ua == NULL) || (ua[0] == 0)) { 913 /* address unknown */ 914 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 915 goto error; 916 } 917 address = uaddr2taddr(nconf, ua); 918 #ifdef ND_DEBUG 919 fprintf(stderr, "\tRemote address is [%s]\n", ua); 920 if (!address) 921 fprintf(stderr, 922 "\tCouldn't resolve remote address!\n"); 923 #endif 924 xdr_free((xdrproc_t)xdr_wrapstring, 925 (char *)(void *)&ua); 926 927 if (! address) { 928 /* We don't know about your universal address */ 929 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 930 goto error; 931 } 932 CLNT_CONTROL(client, CLGET_SVC_ADDR, 933 (char *)(void *)&servaddr); 934 __rpc_fixup_addr(address, &servaddr); 935 goto done; 936 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 937 struct rpc_err rpcerr; 938 939 clnt_geterr(client, &rpcerr); 940 if (rpcerr.re_vers.low > RPCBVERS4) 941 goto error; /* a new version, can't handle */ 942 } else if (clnt_st != RPC_PROGUNAVAIL) { 943 /* Cant handle this error */ 944 rpc_createerr.cf_stat = clnt_st; 945 clnt_geterr(client, &rpc_createerr.cf_error); 946 goto error; 947 } 948 } 949 950 error: 951 if (client) { 952 CLNT_DESTROY(client); 953 client = NULL; 954 } 955 done: 956 if (nconf->nc_semantics != NC_TPI_CLTS) { 957 /* This client is the connectionless one */ 958 if (client) { 959 CLNT_DESTROY(client); 960 client = NULL; 961 } 962 } 963 if (clpp) { 964 *clpp = client; 965 } else if (client) { 966 CLNT_DESTROY(client); 967 } 968 return (address); 969 } 970 971 972 /* 973 * Find the mapped address for program, version. 974 * Calls the rpcbind service remotely to do the lookup. 975 * Uses the transport specified in nconf. 976 * Returns FALSE (0) if no map exists, else returns 1. 977 * 978 * Assuming that the address is all properly allocated 979 */ 980 int 981 rpcb_getaddr(rpcprog_t program, rpcvers_t version, 982 const struct netconfig *nconf, struct netbuf *address, 983 const char *host) 984 { 985 struct netbuf *na; 986 987 _DIAGASSERT(address != NULL); 988 989 if ((na = __rpcb_findaddr(program, version, nconf, 990 host, NULL)) == NULL) 991 return (FALSE); 992 993 if (na->len > address->maxlen) { 994 /* Too long address */ 995 free(na->buf); 996 free(na); 997 rpc_createerr.cf_stat = RPC_FAILED; 998 return (FALSE); 999 } 1000 memcpy(address->buf, na->buf, (size_t)na->len); 1001 address->len = na->len; 1002 free(na->buf); 1003 free(na); 1004 return (TRUE); 1005 } 1006 1007 /* 1008 * Get a copy of the current maps. 1009 * Calls the rpcbind service remotely to get the maps. 1010 * 1011 * It returns only a list of the services 1012 * It returns NULL on failure. 1013 */ 1014 rpcblist * 1015 rpcb_getmaps(const struct netconfig *nconf, const char *host) 1016 { 1017 rpcblist_ptr head = NULL; 1018 CLIENT *client; 1019 enum clnt_stat clnt_st; 1020 rpcvers_t vers = 0; 1021 1022 client = getclnthandle(host, nconf, NULL); 1023 if (client == NULL) { 1024 return (head); 1025 } 1026 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1027 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1028 (char *)(void *)&head, tottimeout); 1029 if (clnt_st == RPC_SUCCESS) 1030 goto done; 1031 1032 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1033 (clnt_st != RPC_PROGUNAVAIL)) { 1034 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1035 clnt_geterr(client, &rpc_createerr.cf_error); 1036 goto done; 1037 } 1038 1039 /* fall back to earlier version */ 1040 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1041 if (vers == RPCBVERS4) { 1042 vers = RPCBVERS; 1043 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1044 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1045 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1046 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1047 goto done; 1048 } 1049 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1050 clnt_geterr(client, &rpc_createerr.cf_error); 1051 1052 done: 1053 CLNT_DESTROY(client); 1054 return (head); 1055 } 1056 1057 /* 1058 * rpcbinder remote-call-service interface. 1059 * This routine is used to call the rpcbind remote call service 1060 * which will look up a service program in the address maps, and then 1061 * remotely call that routine with the given parameters. This allows 1062 * programs to do a lookup and call in one step. 1063 */ 1064 enum clnt_stat 1065 rpcb_rmtcall( 1066 const struct netconfig *nconf, /* Netconfig structure */ 1067 const char *host, /* Remote host name */ 1068 rpcprog_t prog, 1069 rpcvers_t vers, 1070 rpcproc_t proc, /* Remote proc identifiers */ 1071 xdrproc_t xdrargs, 1072 const char *argsp, /* Argument */ 1073 xdrproc_t xdrres, /* XDR routines */ 1074 caddr_t resp, /* Result */ 1075 struct timeval tout, /* Timeout value for this call */ 1076 const struct netbuf *addr_ptr) /* Preallocated netbuf address */ 1077 { 1078 CLIENT *client; 1079 enum clnt_stat stat; 1080 struct r_rpcb_rmtcallargs a; 1081 struct r_rpcb_rmtcallres r; 1082 rpcvers_t rpcb_vers; 1083 1084 stat = RPC_FAILED; /* XXXGCC -Wuninitialized [dreamcast] */ 1085 1086 client = getclnthandle(host, nconf, NULL); 1087 if (client == NULL) { 1088 return (RPC_FAILED); 1089 } 1090 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, __UNCONST(&rmttimeout)); 1091 a.prog = prog; 1092 a.vers = vers; 1093 a.proc = proc; 1094 a.args.args_val = argsp; 1095 a.xdr_args = xdrargs; 1096 r.addr = NULL; 1097 r.results.results_val = resp; 1098 r.xdr_res = xdrres; 1099 1100 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1101 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1102 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1103 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1104 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1105 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1106 struct netbuf *na; 1107 na = uaddr2taddr(__UNCONST(nconf), r.addr); 1108 if (!na) { 1109 stat = RPC_N2AXLATEFAILURE; 1110 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1111 goto error; 1112 } 1113 if (na->len > addr_ptr->maxlen) { 1114 /* Too long address */ 1115 stat = RPC_FAILED; /* XXX A better error no */ 1116 free(na->buf); 1117 free(na); 1118 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1119 goto error; 1120 } 1121 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1122 ((struct netbuf *)__UNCONST(addr_ptr))->len = na->len; 1123 free(na->buf); 1124 free(na); 1125 break; 1126 } else if ((stat != RPC_PROGVERSMISMATCH) && 1127 (stat != RPC_PROGUNAVAIL)) { 1128 goto error; 1129 } 1130 } 1131 error: 1132 CLNT_DESTROY(client); 1133 if (r.addr) 1134 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1135 return (stat); 1136 } 1137 1138 /* 1139 * Gets the time on the remote host. 1140 * Returns 1 if succeeds else 0. 1141 */ 1142 bool_t 1143 rpcb_gettime(const char *host, time_t *timep) 1144 { 1145 CLIENT *client = NULL; 1146 void *handle; 1147 struct netconfig *nconf; 1148 rpcvers_t vers; 1149 enum clnt_stat st; 1150 1151 1152 if ((host == NULL) || (host[0] == 0)) { 1153 time(timep); 1154 return (TRUE); 1155 } 1156 1157 if ((handle = __rpc_setconf("netpath")) == NULL) { 1158 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1159 return (FALSE); 1160 } 1161 rpc_createerr.cf_stat = RPC_SUCCESS; 1162 while (client == NULL) { 1163 if ((nconf = __rpc_getconf(handle)) == NULL) { 1164 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1165 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1166 break; 1167 } 1168 client = getclnthandle(host, nconf, NULL); 1169 if (client) 1170 break; 1171 } 1172 __rpc_endconf(handle); 1173 if (client == NULL) { 1174 return (FALSE); 1175 } 1176 1177 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1178 (xdrproc_t) xdr_void, NULL, 1179 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1180 1181 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1182 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1183 if (vers == RPCBVERS4) { 1184 /* fall back to earlier version */ 1185 vers = RPCBVERS; 1186 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1187 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1188 (xdrproc_t) xdr_void, NULL, 1189 (xdrproc_t) xdr_int, (char *)(void *)timep, 1190 tottimeout); 1191 } 1192 } 1193 CLNT_DESTROY(client); 1194 return (st == RPC_SUCCESS? TRUE: FALSE); 1195 } 1196 1197 /* 1198 * Converts taddr to universal address. This routine should never 1199 * really be called because local n2a libraries are always provided. 1200 */ 1201 char * 1202 rpcb_taddr2uaddr(struct netconfig *nconf, struct netbuf *taddr) 1203 { 1204 CLIENT *client; 1205 char *uaddr = NULL; 1206 1207 /* parameter checking */ 1208 if (nconf == NULL) { 1209 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1210 return (NULL); 1211 } 1212 if (taddr == NULL) { 1213 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1214 return (NULL); 1215 } 1216 client = local_rpcb(); 1217 if (! client) { 1218 return (NULL); 1219 } 1220 1221 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1222 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1223 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1224 CLNT_DESTROY(client); 1225 return (uaddr); 1226 } 1227 1228 /* 1229 * Converts universal address to netbuf. This routine should never 1230 * really be called because local n2a libraries are always provided. 1231 */ 1232 struct netbuf * 1233 rpcb_uaddr2taddr(struct netconfig *nconf, char *uaddr) 1234 { 1235 CLIENT *client; 1236 struct netbuf *taddr; 1237 1238 1239 /* parameter checking */ 1240 if (nconf == NULL) { 1241 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1242 return (NULL); 1243 } 1244 if (uaddr == NULL) { 1245 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1246 return (NULL); 1247 } 1248 client = local_rpcb(); 1249 if (! client) { 1250 return (NULL); 1251 } 1252 1253 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1254 if (taddr == NULL) { 1255 CLNT_DESTROY(client); 1256 return (NULL); 1257 } 1258 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1259 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1260 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1261 tottimeout) != RPC_SUCCESS) { 1262 free(taddr); 1263 taddr = NULL; 1264 } 1265 CLNT_DESTROY(client); 1266 return (taddr); 1267 } 1268